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5-8 Using Block Transfer Messaging
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
Ladder Logic Program
Figure 5.3 ControlLogix Example Ladder Logic for Block Transfer Messaging
Tag Name Type
SendMessageRequest BOOL
SendMessageRequestOneShot BOOL
PerformingMessagingRequest BOOL
MessagingRequestError BOOL
The20CommR:I AB:RIO_4IOGROUP:I:0
MsgBlockTransferWrite MESSAGE
MsgBlockTransferRead MESSAGE
0
Copy File
Source The20CommR:I.Data[0]
Dest BlockTransferStatus
Length 1
COP
Make a local copy of the block transfer status word to avoid it changing mid-scan.
1
SendMessageRequest
ONS
SendMessageRequestOneShot
L
PerformMessagingRequest
U
MessagingRequestError
When the user enables the SendMessageRequest tag, start the message logic.
2
PerformMessagingRequest
BlockTransferStatus.9
/
BlockTransferStatus.10
EN
DN
ER
Type - Block Transfer Write
Message Control MsgBlockTransferWrite
...
MSG
When requested (and the 20-COMM-R is ready), send the messaging request to the drive.
3
PerformMessagingRequest
BlockTransferStatus.10
EN
DN
ER
Type - Block Transfer Read
Message Control MsgBlockTransferRead
...
MSG
Pick up the messaging response from the drive.
4
PerformMessagingRequest
MsgBlockTransferRead.DN
U
PerformMessagingRequest
Once the response is complete, end the messaging transaction.
5
PerformMessagingRequest
BlockTransferStatus.11
L
MessagingRequestError
U
PerformMessagingRequest
If a messaging error occurs, end the transaction and indicate the error.
(End)
- User Manual 1
- Important User Information 2
- Summary of Changes 3
- Table of Contents 5
- About This Manual 7
- Rockwell Automation 8
- Additional Resources 8
- Resource Description 9
- About This Manual P-3 9
- P-4 About This Manual 10
- Getting Started 11
- Features 12
- Compatible Products 13
- Required Equipment 13
- User-Supplied Equipment 14
- Safety Precautions 15
- Quick Start 16
- Installing the Adapter 17
- Commissioning the Adapter 18
- Connecting the Adapter to 20
- Applying Power 24
- 2-10 Installing the Adapter 26
- Configuring the Adapter 27
- Using the PowerFlex 7-Class 28
- HIM to Access Parameters 28
- Setting the Rack Address 29
- Setting the Baud Rate 30
- Setting the Starting Module 30
- Setting the Last Rack 31
- Setting the Rack Size 31
- Setting the I/O 32
- Configuration 32
- Setting a Fault Action 33
- Resetting the Adapter 34
- Viewing the Adapter Status 35
- Using Parameters 35
- Updating the Adapter 36
- Firmware 36
- Chapter 4 37
- Understanding the I/O Image 38
- Discrete I/O Image 40
- Size Valid Values 41
- 16-bit -32768 to 32767 41
- Block Transfer I/O Image 43
- Rules for Using Datalinks 44
- Datalink Scaling 45
- Example Ladder Logic 47
- Program Information 47
- ControlLogix Controller 48
- PLC-5 Controller Example 51
- Block Transfer Read 53
- Block Transfer Write 54
- All Controller Versions 55
- Chapter 5 59
- About Block Transfer 60
- Messaging 60
- Formatting Block Transfer 60
- Messages 60
- Executing Block Transfers 63
- Example Programs 64
- Ladder Logic Program 66
- SLC 500 Controller 69
- Examples 69
- Troubleshooting 75
- PORT Status Indicator 76
- MOD Status Indicator 76
- NET A Status Indicator 77
- Viewing Adapter Diagnostic 77
- Viewing and Clearing 79
- Table 6.B Adapter Events 80
- Specifications 81
- Regulatory Compliance 82
- Adapter Parameters 83
- CIP Objects 87
- Common Messages 88
- DPI Device Object 89
- DPI Parameter Object 91
- Descriptor Attributes 93
- Formulas for Converting 94
- Object-Specific Services 94
- DPI error code 95
- DPI Fault Object 101
- Instance Attributes 102
- DPI Alarm Object 103
- DPI Time Object 105
- C-20 CIP Objects 106
- Logic Command/Status Words 107
- Logic Status Word 108
- PowerFlex 700S (Phase II 109
- Control) and 700L (with 109
- 700S Control) Drives 109
- PowerFlex 750-Series Drives 111
- PowerFlex Digital DC Drives 113
- Glossary 115
- D Datalinks 116
- F Fault Action 117
- I Idle Action 118
- L Last RIO Rack 118
- N NVS (Nonvolatile Storage) 118
- R Rack Address 119
- S Scanner 120
- U Update 120
- Z Zero Data 120
- Rockwell Automation Support 128
- Documentation Feedback 128
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